Extension-screen.



L L A.PFE|FFER.

EXTENSION SCREEN.

APPLICATION FILED NOV.9.i9l5.

1 1 97,85 1 Patented Sept. 12, 1916.

3 SHEETS-SHEET 1.

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INVENTOR ATTORNEY 1.1. A. PFEIFFER.

EXTENSION SCREEN.

- APPUCATION FILED NOV- 9. 1915. I 1 ,1 97,85 1 Patented Sept. 12, 1916.

3 SHEETS-SHEET 2.

ATTOR N EY J. J. A. PFEIFFER.

EXTENSION SCREEN.

APPLICATION FILED NOV. 9. 1915.

3 SHEETS-SHEET 3.

r I p llfVENTOFI zfrrgfiw W W JOHN J. AUG. PFEIFFER, 0F YORK, PENNSYLVANIA.

EXTENSION-SCREEN.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Application filed November 9, 1915. Serial No. 60,568.

To all whom it may concern:

Be it known that I, JOHN J. AUG. PFnIF- rnn, a citizen of the United States, residing at York, in the county of York and State of Pennsylvania, have invented certain new and useful Improvements in Extension- Screens, of which the following is a specification.

An object of the present invention is to provide a screen of the extension type in which the side bars of the twoextension members are telescopically connected to slide one within the other, and to thus make the side bars of a substantially uniform transverse dimension throughout the length of the screen regardless of the extension which may be given to the same.

A further object is to mount bearings between the telescoping side bars which will insure proper sliding movement and preclude binding of the same as adjustments are made.

Yet another object is to so connect the netting with the frame that removal and renewal of the same may be accomplished at any time and without the aid of special tools or a skilled mechanic.

With other objects in view which will be referred to. my invention consists in certain other novel features of construction and combinations of parts which will be hereinafter more fully described in connection with the accompanying drawings and pointed out in the claims.

In the drawings: Figure 1 is a view in front elevation of a screen constructed after my invention. Fig. 2 is a transverse sectional View taken on the line 22 of Fig. 1. Fig. 3 is a transverse vertical sectionalview taken on the line 33 of Fig.6. Fig. 4: is a view similar to Fig. 3 and taken on the line 4l1 of Fig. 6. Fig. 5 is a transverse sectional View on the line 5+5 of Fig. 6 to better illustrate the 'mounting of the side bars and the disposition of the bearings.

The member A comprises the side bars 1 and 2 which are connected by the end piece 3 so that in side elevation they present a substantially U-shaped formation, and the member B is constructed in the same manner, the sidebars 1 and 5 being connected in the U-shaped formation by the end mem- It is preferable that, as shown more particularly in Figs. 2 to 6 inclusive, the side bars 1 and 2 of the member A be formed of sheet metal or tube which is substantially rectangular in cross section and the side bars 4 and 5 of the member B are also of the rectangular tubular form and are made of a size to have a sliding fit within the tubular side bars 1 and 2. For the sake of uniformity the end members 3 and 6 may also be made of the rectangular tubular form and the side bars and end members of the two portions of the screen frame may be connected by invisible brackets disposed within the tubular formation, by welding, or secured in any other desired manner so long as the structure thus formed is rigid.

The annular grooves or ball tracks 7 and 8 are impressed into the sides of the bars 4 and 5 and the metal at the sides of the bars 1 and 2 is expressed outwardly to form the internal grooves or ball tracks 9 and 10, all of said tracks being so formed that they are in alinement when the side bars 4 and 5 are telescopically mounted in the side bars 1 and 2.

The bearing balls 11 and 12 are revolubly mounted on the shafts 13 and 14 carried by the side bars 4 and 5 and these bearing balls 11 and '12 are thus disposed to fit within the ball-tracks 9 and 10 of the side bars 1 and 2 and to thus relieve friction between the inner ends of the side bars 4 and 5 and the inner walls of the tubular side bars of the member A of the screen. A second set of balls, here designated as 15 and 16 are revolubly mounted on the shafts 17 and 18 carried by each of the side bars 1 and 2, these bearing balls being disposed to fit in the ball tracks 7 and 8 of the side bars 4 and 5.

By mounting the bearing balls to relieve friction between the side bars of the members A andB, all binding efiect in the telescopic extension movement of the members is relieved and if the parts be made sufficiently rigid to prevent warping of the members, the frame structure will last prac;

tically indefinitely. That a netting structure may be provided to fill in the frame members and to be removable and renewable therein, I have provided the netting frames 19 and 20 which may be duplicates for the two members. These netting frames 19 and 20 are rectangular in form and are made of a size to fit within the U-shaped structure of the members A and B of the frame, the net-- ting indicated at 21 being stretched. between the side members of the netting frames 19 and 20 and secured in place thereon. That the side bars 1 and 5 of the member B may be telescopically fitted within the side bars 1 and 2 of the member A and the netting may be attached to these side bars 1 and 5, it is necessary to form the slotted openings 22 on the inner side walls of the bars 1 and 2 and thus the angle members 23 and 241 may be secured on the inner faces of the side members 1 and 5 at spaced apart intervals to receive the sides of the netting frame 20. Angle members 25 are connected with the side bars 1 and 2 to extend parallel with the slotted openings 22 and at a point spaced therefrom, and the straight bar members 26 are provided to be companion securing means with the angle members 25 the frame portion of the netting frame 19 being re ceived between the angle and bar members 25 and 26. To secure the netting frames 19 and 20 in place and to permit removal thereof as before mentioned I provide the screws 27 which are passed through the two angle members of the screen member B to hold the netting frame 20 properly mounted therein, and which passed throughthe angle member 25 and. into the bar member 26 to secure the netting frame 19 in the operative relation. To remove the netting frames 19 and 20 it is only necessary to withdraw the screw bolts 27 and the netting frame may then be withdrawn and replaced by the frames containing new netting or the netting of the original frames may be replaced.

As the balls 11 and 12 are mounted at a fixed point on the inner ends of the side bars 1 and 5 and the bearing balls 15 and 16 are carried at fixed points by the outer ends of the side bars 1 and 2, when the screen frame members A and B have been extended to their greatest length the balls 11. and 12 will contact with the bearing balls 15 and 16 and will hold the members against further movement and against extension to a disassembled relation, however, it is advisable that some means be provided to fill in the openings left by the formation of the ball tracks in the side walls of the side bars and for this purpose, the clip members 28 are provided to be secured to the ends of the side bars 1 and 2 and have the tongues '29 thereof arranged at right angles to fill in the space left by the ball tracks. I

The screen as described will be used in the same manner as the ordinary extension screen and as the bearing balls are provided to relieve frictional contact between the telescoping side bars of the members A and B, extension and contraction of the width of the screen will be readily accomplished, also by the simple operation of removing the screw bolts 27, the netting frames 19 and 20 may be withdrawn to permit renewal of the netting.

While I have here shown and describedremaining member, and. friction reducing means connected with each of said side bars to have bearing against the mating side bar. 2. An extension screen having a pair of substantially U shaped frame members formed of tubing having a rectangular cross section and arranged to have the side bars of the one member telescopically and slidablyreceived in the side bars of the remaining members, the outer side bars having a slotted opening formed longitudinally thereof, a netting carrying member secured to the inner side bars to move within the slotted opening, and a netting carrying member mounted on the outer side bars to move adjacent said first netting carrying member.

8. An extension screen having the side bars of the two members formed of metal tubing substantially rectangular in cross section and arranged to have the side bars of the one member telescopically and slidably received in the side bars of the remaining member, ball tracks formed on each of said s1de bars, and bearing balls mounted in said tracks to relieve the sliding friction between said sidebars.

4. An extension screen having the side bars of the two members formed of metal tubing substantially rectangular in cross section and arranged. to have the side bars of the one member telescopically and slidably received in the side bars of the remaining member, ball tracks formed on each of said side bars, bearingballs mounted in said tracks to relieve the sliding friction between said side bars, and netting carrying frames removably mounted in conjunction with each of said members.

5. An extension screen having the side bars of the two members formed of metal tubing substantially rectangular in cross section and arranged to have the side bars of the one member telescopically and slidably received in the side bars of the remaining member, ball tracks formed on each of said side bars, bearing balls mounted in said tracks to relieve the sliding friction between said side bars, and means to revolubly mount said bearing balls at fixed points on said side bars.

6. An extension screen having a pair of substantially U shaped frame members formed of metal tubing which is rectangular in cross section and arranged to have the side bars of the one member telescopically and slidably received in the side bars of the remaining member, the outer side bars provided with slotted openings, each of said side bars provided with ball tracks, bearing balls mounted in said tracks, a netting carrying frame connected with the inner side bars to have movement in the slotted openings of the outer bars, and a netting carrying frame removably mounted on the outer side bars to move adjacent said first. netting carrying frame.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN J. AUG. PFEIFFER. Witnesses:

HENRY S. LANDIS, FRANKLIN LEADER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, I). G." 

